Really it depends on how much human presence and what kind they're exposed to. If every time they smell a human a bullet comes their way they're gonna be quick to git out of Dodge.
I've seen piglets more than 1/4 mile from momma, but that's in open country and well within squeeling distance. I've also seen momma hogs chase deer out and then get chased out in turn by cattle. Pretty amusing.
BTW: there is NOTHING better than barbecued piglet. Nothing.
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